package com.paperobot.common.util;

import java.security.*;


public class CipherUtil {
	
	 //十六进制下数字到字符的映射数组   
    private final static String[] hexDigits = {"0", "1", "2", "3", "4",   
        "5", "6", "7", "8", "9", "a", "b", "c", "d", "e", "f"};   
    
	public static String endodePassword(String inputString){   
        return encodeByMD5(inputString);   
    }   
	
    /**  对字符串进行MD5加密     */  
    private static String encodeByMD5(String originString){   
        if (originString != null){   
            try{   
                //创建具有指定算法名称的信息摘要   
                MessageDigest md = MessageDigest.getInstance("MD5");   
                //使用指定的字节数组对摘要进行最后更新，然后完成摘要计算   
                byte[] results = md.digest(originString.getBytes());   
                //将得到的字节数组变成字符串返回   
                String resultString = byteArrayToHexString(results);   
                return resultString.toUpperCase();   
            } catch(Exception ex){   
                ex.printStackTrace();   
            }   
        }   
        return null;   
    }   
       
    /**   
     * 转换字节数组为十六进制字符串  
     * @param     字节数组  
     * @return    十六进制字符串  
     */  
    private static String byteArrayToHexString(byte[] b){   
        StringBuffer resultSb = new StringBuffer();   
        for (int i = 0; i < b.length; i++){   
            resultSb.append(byteToHexString(b[i]));   
        }   
        return resultSb.toString();   
    }   
       
    /** 将一个字节转化成十六进制形式的字符串     */  
    private static String byteToHexString(byte b){   
        int n = b;   
        if (n < 0)   
            n = 256 + n;   
        int d1 = n / 16;   
        int d2 = n % 16;   
        return hexDigits[d1] + hexDigits[d2];   
    }   


}
